Chuck



C. E. GILBERT.

CHUCK.

FILED y ATI 29, 19.19. 1,352,951, PatentedSept. 14,1920.

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UNITED srfres4A PATENT orages. I

CHARLES E. GILBERT, F NORTH CHICHESTER, NEW HAMPSHIRE.

cHUcK.

To all whom t may concern:

Be it known that I, CHARLES E. GILBERT, a citizen of the United States, residing at North Chichester, county of Merrimack, State of New Hampshire, have invented an Improvement in Chucks, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to improvements in chucks, and the object thereofis to provide a simple and effective construction by means of which the desired adjustment of the jaws may be secured with. a minimum effort, and iny which the aws may be locked effectively upon the material held by them and readily Y released when it is desired to remove the established. v

lA further'obj ect of the invention is to provide locking means .for the adjustable lmember of the thrust bearing, which will prevent the chuck from loosening onits driving head when in operation'.v

1 Another object of the invention is to provide a form of chuck in .which the mem'- bers can be mademo're accurately upon usual machines and in which the proper coperation of the parts of the chuck will be insured.

Other objects and features ofthe invention will more fully appear from the following description and the accompanying drawings c and will be pointed out in the annexed claims. l i f A preferred form of chuck embodyingjmy invention is illustrated yin the accompanying drawings, lin which-f Figure 1 is a vertical, longitudinal, sectional view of the chuck body showingthe chuck head and arbor upon which it is car-v Y ried in elevation,

Fig. 2 isa transverse, sectional view von lines 2 2, Fig. 1,` f

' with oppositely A the (nut.

Specification of Letters Patent. Patentgd Sept. 14:, lggo Application Vfiled. 29, 1919. Serial No. 300,514.

Fig. S-is a transverse, sectional view on The'illustrative chuck, shown .infthle ac-` companying drawing as embodying lmy inf vention, comprises a head 1 of generally cylindrical vform having a central conical aperture 2 adapted to receive the usual arbor 43 of the driving shaft. The free end Vofthe head has 'a conically tapered portion 4 which is' provided with the usual screw threads 5 Vwhich engage complementary screw Vthreads drical head 1 alsois provided about midway with an vintegral annular flange 10 forming a member cfa-,compound thrust bearing,

which will hereinafter be described. TheV head thus constructed may be turned upon a usual form of lathe or a screw machine, without the necessityvof removing the stock, from the machine. Consequently, the flange 10 may be formed Ywith accuracy `in respect to 'the axis of the head. j

The chuck body includingthe guide-ways 8' for the jaws 7 maybe of a usual construction, the central cylindrical chamber 11V of the body being constructed to lit upon`the Y cylindrical member lof the head. The inner wall of the body of the chuck is provided with an v,annular recess 12 forming an en'- largeinent of the chamber 11 and presenting a wall 13 and a shoulder 14 adapted to form a race-way for a series of balls 15 adapted to engage the annular flange 10 on the head 2. The recess '12 is of a sufficient area to enablethe wall 13 to 'form the outer boundary of Va race-way 16 having" a series of balls 17 of amthrust bearing oppositely disposed to the thrust bearing above del scribed. A' nut 18 desirably having a flat A ,hardened face 19 adapted to engage the balls 17 and complete the race-way therefor is kadjustably mounted in the chuck body 9,

preferably having screw threads 20 engaging complementary screw threads in a recess 21 which is concentric with but larger than the recess 12. rl`he nut 18may be provided disposed apertures 22 adaptedto receive a spanner f for adjusting Suitable locking means fare pro'- vided .for retaining the nut 18 in adjusted position. Y

A preferred locking means, which is illus,- trated herein, comprises a supplementary or locking nut 23 having screw threads 24 en- 50 when assembled accurate cooperation will be gaging complementary threads in the wall of a recess 25, which is concentric witlrbut larger than the recess 2l. T he screw threads 24; desirably are of opposite pitch to the screw threads 20. The nut 23 may also be provided with recesses 26, 27 to receive a Spanner. ln order to prevent the movement of the locking nut 23 from disturbing the adjustment oi the nut i8, a washer 28 is interposed between the nuts 23 and 18, said washer preferably having a projection or lug 2.9 engaging a suitable recess 30 in the body member.

By reason of the tact that the chamber `Jfor the head, the recess Vfor the ball bearings, and the recesses for the nutsl 18 and 28 are concentric they can all be formed in the chuck wall while it remains in the lathe or screw machine in which it is being turned. Consequently, the accuracy of the alinement of the wallsot such recesses with the aXis t' the body is insured, and when the head is assembled therein the aXiso the chuck and head will necessarily be coincident and the accuracy ot the relation ofthe ball races to the ange lO upon the head thus insured. By constructing the chuck in the manner afore- `said all of the parts may be suitably hardened without danger of distortion, so that a chuck will be provided which will wear longer and be of better service than theusual .form-ot' chuck in which some of the parts remain necessarily in an unhardened conf dition. i Y

TheV thread of the chuck jaws preferably is concave and fits closely the tapered portion t of the end of the head 2, so that torsional strain upon the screw threads is avoided. The oppositely disposed ball bearings insure an easy release of the chuck jaws and prevent the setting of the jaws under a working strain. The right and lett hand adjusting nuts with a lock washer between allo-w an accurate adjustment of the thrust bearing of the driving cone and also prevent the chuck from being loosenedr by lstrain when in operation. The members of the chuck are so constructed that they may be made with a minimum number of operations,

and, as above stated, are so designed that insured. c

It will be understood that the embodiment of my invention disclosed herein is of an illustrative character and that various changes may be made within the meaning and scope of the following claims.

Having thus described my invention what I claim as new and desire to secure by Let.- ters Patent is:

l. A'chuck comprising a head having a tapered screw threaded end, an inclosing integralV body portion having converging guide-ways, jaws slidably mounted in said guide-ways having threaded faces engaging the screw threads of saidhead, oppositcly disposed thrust bearings intermediate of said head and body comprising an integral flange on said head, a complementary recess in said body, balls in said recess on opposite sides of said flange, and an adjustable nut engaging one set of balls and with the walls oit-the recess forming a race-way therefor.

2. A chuck comprising a head having a tapered screw threaded end, an inclosinig body portion having converging guideways, jaws slidably mounted in said guide-ways having threaded faces engaging ythe screw threads of said head, oppositely disposed a having threaded faces engaging the screw r threads of said head, oppositely' disposed thrust bearings intermediate ofi said head and body comprising an integral annular flange on said head, a complementary recess insaid body, balls in said recess on opposite sides of saidflange, 'an adjustable nut engaging one set of said balls, and a locking nut having threaded engagementrwith said chuck, the threads of said lockingl nut being of opposite pitch to those of the ball engaging nut, a washer intermediate of said ball engaging nut and said locking nut, and means for preventing vthe rotation of said washer. l.

4. A chuck comprising Va head having Va cylindrical portion provided with'an annular iange and a tapered screw threadedrend, an inclosing integral body portion having a central cylindrical chamber fitting the cylindrical portion of saidhead and forming a bearing therefor, and an annular recessto receive said ange, the walls of said recess presenting ball race-ways on opposite sides of said flange, balls in said race-ways, and a nut having screw threaded engagement with said body portion engaging oneof said sets oballs. i i

5. A chuck comprising a head having a cylindrical portion provided with an.annu' lar flange and a tapered screw threaded end, an inclosing body portion having a central cylindrical chamber iittingl the Ycylindrical portion of said head and forming a bearing therefor, and an annular recess toV receive said lflange, the walls of said recess presenting ball race-ways on opposite sides oi said iio lso

flange, a ball engaging nut of larger diameing nut, and a Washer intermediate of said ter than said race-Way, having screw threadnuts having an extension projecting into a ed engagement With said body serving to recess in said body.

complete one of said race-Ways, and a lockl In testimony whereof, I have signed my 5 ing nut of larger diameter than said ball enname to this speoiioation.

gaging nut, provided With screw threads of opposite pitch from those of the ball engag- CHARLES E. GILBERT. 

